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Just did 1000 miles to canada and back got 20.3 mpg with the cruise set at 68 mph.Im very happy with that for a 08 5.4 crew with 3.73s.Sucks going that slow but i wanted to see how good it would get. K+n drop in+tonneau cover dont know if they helped or not probably not. rpms 1800
At my last fill-up, I calculated 17.26 MPG.
80%highway, but no one can do a constant speed so the cruise gets adjusted....a lot.
Or I end up having to pass at which point, i just floor it.
Truck is bone stock....for now.
I could probably get better if I stopped stomping the pedal at take-offs.
But, coming from a 7.3L non-turbo diesel engine....can you blame me for loving the power?